Controlling device



* 0t.25,193s. w, SMIT R 2,134,420

' CONTROLLING DEVICE Filed March 3, 1957 2 Sheets-Sheet 1 Fig -1.

INVENTOR HIS ATTORNEY.

Oct. 25, 1938. W, A SMITH,SR 2,134,420

CONTROLLING DEVICE F iled March 3 1937 2 Sheets-Sheet 2 I 32 M INVENTORH 5 ATTORNEY- Patented Oct. 25, 1938 UNITED STATES CONTROLLING D'EvIC EWilliam A. smith, sh,

Athens, Pa.,' as'signbr to Ingrsoll-RandCbmpany, Jersey 'C ity," N.TJ.,"a

corporation of "New Jersey Application Mal-ch3 1937, Serial.N0.-128,767: 1 s olainis. (Cl. 188-81) This invention relates tocontrolling devices, and more particularly to a controlling device for arotatable member.

One object of the invention is toproventunauthorized rotation of therotatable member.

Another object is to selectively control the direction of rotation ofthe rotatable member.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawings accompanying this specification and in which similarreference numerals refer to similar parts, I Figure 1 is a longitudinalelevation, partly broken away, of a rock drilling mechanism equippedwith a controlling device constructed in accordance with the practice ofthe invention,

Figure 2 is a longitudinal side viewg-partly broken'away, of thecontrolling device,

Figure 3 is. a transverse view taken through Figure 2 on the line 3-3looking in the direction indicated by the arrows,

Figure 4 is a longitudinal side view of a detail,

Figures 5 and 6 are transverse views taken through Figure 4 on the lines5w-5 and 6-6, respectively, and

' Figures 7, 8 and 9 are views similar to FigureB showing variouspositions which the controlling device may assume in practice.

Referring more particularly to the drawings, the invention is shownembodied in a drilling mechanism comprising a rock drill, only a portionof the cylinder 20 and its piston 2| being shown,

'a shell 22 serving as a support for the rock drill, a feed screw 23 anda feed controlling mechanism 24 secured to the rear end of the shell 22.

The feed screw is in threaded engagement with the rock drill or, moreparticularly, with a feed nut 25 carried by the rock drill, and thethreads of the feed screw and feed nut are of such inclination that thefeed screw may be readily rotated by moving the rock drilllongitudinally of the shell. The front end of the-feed screw may be Yjournalled, in a well known manner, in the corresponding end of theshell, and the rear end of the feed screw 23 extends into the casing 26of the feed controlling mechanism and is suitably secured, as by meansof a key 21, to a flange 28 in the casing 26.

On the periphery of the flange 28 and keyed thereto are a pair ofratchet rings 29 and 30 having teeth 3| and being of slightly smallerdiameter than the interior of the casing 26 so that the inner surface 32of the casing may serve as a bearing for the rings. The rear end of thefeed screw 23 is, however, additionally supported byinner: and outerheads -33 and' 34, respectively, of I q the casing 26. a a i Tothe endthat the dire'ction of rotation 'of the feed screw 23 may beconveniently control-ledfa pair of pawls 35 and 36 are-arranged withinthe casing 26 to oscillate withina cavity 31 within the casing.Thepawlsinclinei'n' different directions and have hub portions38 whichare boredto accommodate a pivot pin 39 supported by "the head 33-. Thepawls: are arranged in end' toend fashion. designated 35'lies in'thesametransverse plane as the ratchet 30 while 'thatdes'ig'nated'BGliesin'the transverse'plane of th'eratch'et wheel 2941.1? In order thatth'epawls mayg-b'econstantly urged toward the teeth-:5 3| ifor'enga'gement therewith spring-pressed.plungers? 40': are disposed 1 in-the wall of the casing toseat against the pawls." -,.'As

a preferred form: of 1 construction, however; the plungers and theirsprings are arranged in caps 4| threaded into the casing. Thus, wheneverthe plungers 40 become worn or their springs require replacement thecaps 4| may be conveniently unscrewed from the casing for purposes ofreplacement or inspection.

The means employed for shifting the pawls to" their various controllingpositions comprises a rod 42 having a pair of cams 43 and 44 to'bearagainst the pawls 35 and 35, respectively, for moving said pawls out ofengagement with the teeth 3|. The rod is journalled in the heads 33 and34 and is provided with a lever 45 arranged on the projecting end of therod for rotating the rod. The portions of the rod adjacent the pawls arerecessed to provide fiat surfaces 46 and 41 adjacent the cams 43 and 44,respectively. The sur- They may abut each other and .thepawl facesadjacent each cam are arranged angula-rly with respect to each other andmay serve as bearing surfaces for the pawls in their tooth engagingpositions.

During the operation of the device and assuming thatthe pawls are out ofengagement from the teeth 3| the ratchets and'the feed screw may berotated freely in either direction, In a structure such asthat'illustrated and wherein the rock drill is in threaded engagementwith the feed screw, a force tending to move the rock drillIongitudinally of the shell 22 will, therefore, rotate the feed screw23. In the arrangement shown the force employed for this purpose is thatof the jar imparted to the rock drill casing by the piston 2| at theinstant of reversal of the piston in the ends of the cylinder 20. Thus,when the piston 2| reaches the rear extremity of its stroke the shockimparted to the cylinder 20 tends to move the rock drill in thedirection of the casing 26. In like manner, when the piston reverses itsdirection of movement in the front end of the cylinder 20 the consequentjar tends to carry the rock drill in the direction of the work and, inthe absence of suitable restraining devices, will rotate the feed screw23.

When drilling a hole in the work,therefore,, it

'is desirable-that the feed screw be prevented from rotating when thepiston 2| is reversed in the rear end of the cylinder 20 and that it..bepermitted to rotate when the piston reaches the end of its stroke in thefront end of the-cylinder so that the rock drill will be graduallyadvanced toward the work in accordance'with-the degree of penetration ofthe working implement into the 'work.

In order to assure this movement of1.the=-ro'ck drill the rod 42 isrotated to a positionto permit engagement of the pawl 35 with the teeth'3I and to maintain the pawl 36--out;of the wpatlrof-move- 'ment of theteeth. The rock drill will thong-raduallyadvancetowardithe work and thefeed screw '23. will be intermittently rotated to new, positions andheld 'stationarymomentarily by, the engaging pawl: to preventretrogradexmovement-ofthe rock drill at the instant of reversal of: thepiston; 2 l in the rear end of the-cy i der.

;This operation may-"continue until the-drill steelhas'beengdr-iven intothe-rock to the limit of its. extent. JIherrodlZ. is then, rotated to aposition; in which the pawl iii-engages: theteeth '3] and, the pawl35.;.is:-movedout oi engagement with the teethpas illustrated in Figure7.

.In the .new.:posi.tion of theparts the feed screw is restrained:against-rotation permitting further forward-.movementzof the rock" drilland, thereafter the jars applied:to therrearend ofthe cylinder'by. the:piston: will rotate; the Ieedscrew and enable the rock drill to moverearwardly to its initial position where it may be held by both pawls,as illustrated in Figure 8.

I claim:

1. In a controlling device, the combination of a casing and a rotatablemember in the casing, teeth on the rotatable member, a pair of pawls tengage the teeth and lying indifferent transverse planes in the casing,.a common pivot for the pawls, means constantly tending to press thepawls into engagement with the teeth, and a single control member in thecasing shiftable to ridifierentpositions and having cams movable intoand out of contactwith the pawls to move either pawlseparately or bothpawls simultaneously out of engagementwith' the teeth and to permitsitnultaneous engagement of both pawls with the eth. v

2. Inna controlling device, the combination of a casing and a rotatablemember therein, teeth onthe rotatable :membenza plurality: of: pawls inthe casing-,arranged in, end to endfashiomrza common pivot for thepawls, spring-pressed plungers to-press the pawls into engagement withthe teeth,-and'=means in the casing rotatable: to different positionsto: selectively move the ipawls separately; or simultaneously outQfengagement with the i teethandv to permit; simultaneous :engagement ofall the pawlswwith the teeth.

13L: In: a. controlling device; the combination of acasing-anda'rotatablemember therein, teeth on the rotatable member, aplurality'of-pawls in the casing arranged -in end" to: end fashion, a

common pivot for the :pawls, spring-pressed plungers, to. press thepawls into engagementwith the teeth, :a-rod rotatable in the casing, andcams-on the rod toliftthepawls singly ouc'ollectively out of -engagementwith the teeth.

. A. SMITH,:SR.

